Rock-drill-shell oiler



L. c. BAYLES ROCK DRILL SHELL OILER 'Filed May 27. 1925 H J 1; A Q 11-; v l/ P INVE NTOR.

lcfl.

H15 ATTO NEY Patented Nov. 2 192 6,

3 UNITED STAT as PATEN OFFICE.

LEWIS] C. BAYLES, OEElASTON, PENNSYLVANIA, ASSIGN OR T INGERSOLL-RAND COM- PANY, OF JERSEY CITY, NEW JERS E YQA CORPORATION OF NEW JERSEY.

ROCK-DRILL-SHELL OILER.

application filed May 27,

This invention relates to rock drills, but more particularly to an'oiler for rock drill shells. I I y In rock drills of the type employing shells for supporting and guiding the machine, considerable difliculty has been experienced heretofore in supplyinglubricant in suflicient quantities to the guideways and feed screw ofthe shell. Ordinarily these parts are oiled at intervalsby the operator, but owing to the excessive vibration to which 'they are subjected when the machine is in operation together with the rock dust accumulating thereon, this method of oiling has been found to be insufficieint to prevent undue wear on the relatively movable rbck drill and shell parts. Various means have been devised to compensate for such Wear, one of whi h is to place liners between the shell body and the shell caps and as wear takes place to remove one or more of the liners. This method is in effect onl compensatory and in no wise serves to prevent wear... v

It is therefore an objectof this invention .to automatically supply lubricant vto the shell guideways and feed screw of a rock drill by permitting a portion of intermingled pressure fluid and oil to escape from the cylinder immediately prior'to the main exhaust ofpressure fluid from. the cylinder.- p i Another object is to lengthen the life of the cooperative movable parts of the'rock drill and its shell and to increase the effi-. ciency of machines of this type by intermittently supplying lubricant to these parts while the-drill isin operation. F'urther objects will be} in part obvious and in part pointed. out hereinafter. i

The invention consists of the combination of elements,- featuresof construction and arrangement of parts havin me eneral mode of operation substantia ly as ereinafter described and more particularly po1nt-' ed out in the appended claims and illustrated in the accompanying drawings, in which Figure 1 is a longitudinal view partly in v section of so much of& rock drill as will serve to illustrate the invention,

Figure .2 is a transverse view. taken through Figure 1-on the line 2-2 looking in the directionof the arrows. v

Referring to'the drawings, the invention 1925. Serial No. 33, 317.

is shown embodied in a rock drill of the drifter type having a cylinderA and a front head B secured to the frontend of the cylinder by means of the usual side bolts (not shown). A back cylinder head C .forms an extension of the main cylinder A and in this instance also forms a closure for the rearward'e-nd of the main cylinder A.

- Disposed within the cylinder is a reciprocatory hammer piston D for delivering blows to the drill steel (not shown). Supported within the cylinder A is a front cylinder washer E provided with a bore F to receive slidably the piston nose G. The admission of pressure fluid to the cylinders is controlled by a throttle valve H. Pressure fluid is exhausted from the cylinder through exhaust ports A, said exhaust.

ports beingcontrolled by the head of the piston D. In this instance, the distribption of pressure fluid is effected by the rearwardly reduced extension J of the piston D. Constant pressure is maintained against the rearward face of' the piston extension J and a passage K is formed in the back cylinder C, and controlled by said extension for admitting fluid to the rearward piston face L for driving the piston forwardly. A passage 0 also controlled by said piston. ex-

tension J communicates with longitudinal passages P- and a passage Q, near the for--' ward end of the cylinder for admitting pressure fluid to the forward piston face R.

1 Means are provided for imparting rotary movement to the drill steel and for this purpose, a fluted rifle bar S engages the, piston extension J in the usual manner, and operates therewith for rotating the piston and the drill steel as aunit. But since the parts so far described other than the cylinder A and the piston D formno part of the present invention, further description thereof is cons dered unnecessary.-

M In order to supportand guide therock' drill, a shell-'1- is provided and has. suitable guideways U to receive guides V formed on the cylinder A. The shell T may be se-- cured to a fixedsupport,' as' for instance, a column. For this purpose, a cone shaped member Wis formed integrally with 'the shell and may cooperate with clamps or other suitable means for securing said shell to' the support. a

Suitable means"are p'rovided for feeding.

,the machine forwardly to ,the work and for invention, a

removing it therefrom. To this end, a feed screw X is arranged longitudinally through the shell and may be secured in any suitable manner against longitudinal movement with respect to the shell. A feed screw nut- Y 15 arranged within a hollow lug Z carried by the cylinder A and is threaded internally to receive the threads of the feed screw. A collar 12 is formed on the forward end of the feed nut and serves as a head for said nut. The feed nut Y is held against endwise movement by a. suitable nut vc screwed 0n the rearward end of said feed nut. Rotation of the feed screw may be effected by a suitable 'handle (not shown) secured to the rearward end of the feed screw, said handle being adapted to be rotated by the operator for feeding the drill forwardly as the drill steel penetrates. the work. v I

In accordance with the practice of the pair of small ports or passages d are formed in the wall of the cylinder A to communicate at one end with the cylinder and at the other end with the top and bottom faces of the guides V. Another passage e is formed in the cylinder wallintermediate the passages d and preferably in the same transverse plane. The inner end of the passage 6 communicates with the bore of the cylinder A and the outer opening of said passage is directed toward the feed screw S. The inner ends of the passages 03 and e are so arranged with respect to the exhaust ports A that they will be uncovered by the piston in its forward travel shortly before the uncovering of said exhaust port. The passages d and e are located'adjacent to but rearwardly of the exhaust port A. r

In practice lubricating oil in atomized form is introduced with the pressure fluid into the cylinder by means of either an air line oiling device or'a reservoir located in the tool itself and as tl'lGgPlStOIl is carried in a forward direction and uncovers the passages d and e, a small portion of the pressure fluid carrying this atomized T oil is permitted to escape through the passages d and e and is deposited with less violence on the guideways V and the feed screw X than if blown thereon by the full exhaust. The above described method of supplying lubricant to the guideways and the feed screw has been found to be very elficient in operation. Lubricant is carried to these parts in quantities suflicient to protect the parts againstwear. The amount of pressure fluid required for the'purpose described is .negligible, and since the exhaust of pressure fluid through the pas-' sages d and e takes place immediately PI'IOI' extending through the guides'to the guideways, whereby the said ports are opened bythe piston shortly before the uncovering of the exhaust port, to permit a small portion of the intermingled pressure fluid and oil in the cylinder to pass" through said ports and be deposited with less violence on the guides and uideways than if blown thereon by the f Ill exhaust.

2. In a fluid actuated rock drill, the combination of a cylinder and piston, a piston controlled exh austport, said cylinder having guides, a shell having guideways for said guides and a feed screw for the cylinder in said shell, and small ports located in the wall of the cylinder adjacent to but rear wardly of the exhaust port, said ports extending through the guides to the guide ways, and also directly "through the wall of .the cylinder to a point over the feed screw, whereby all of said ports are opened by the piston shortly before the uncovering of the exhaust port, to permit a small portion .of the intermingled pressure fluid and oil in the cylinder to pass through said ports and be deposited .withjless violence on 'the guides and guideways and the feed screw port, said cylinder having than if blown thereon by the full exhaust In testimony whereof I have signed this specification.

* Lnwrso. BAYLES. 

